巴西坎波斯盆地A区块盐下构造特征及其对油气分布的影响

赵文芳

doi:10.11781/sysydz202002233

巴西坎波斯盆地A区块盐下构造特征及其对油气分布的影响

doi: 10.11781/sysydz202002233

赵文芳

中国石化集团国际石油勘探开发有限公司, 北京 100029

详细信息

作者简介:
赵文芳(1987-), 男, 硕士, 工程师, 从事深海油气勘探开发研究工作。E-mail: wfzhao.sipc@sinopec.com

中图分类号: TE121.2
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出版历程
- 收稿日期: 2020-01-08
- 修回日期: 2020-02-26
- 刊出日期: 2020-03-28

Tectonic controls on the pre-salt hydrocarbon distribution in block A of Campos Basin, Brazil

ZHAO Wenfang

SINOPEC International Petroleum Exploration and Production Corporation, Beijing 100029, China

摘要

摘要: 位于巴西深海坎波斯（Campos）盆地南部的A区块，自晚侏罗世以来经历了多期构造运动，盐下构造特征复杂。结合最新3D地震资料和钻井资料，对该区盐下地层的地质属性、断裂发育及构造演化进行了分析。A区块盐下地层识别出4个地震反射层和3套地震层序；经历了裂谷阶段、倾斜和剥蚀阶段以及热沉降阶段3个构造演化阶段，主要发育正断层，在平面上呈NE向和NNE向展布，受构造运动影响发育了一条NW—SE向转换断层，控制着正断层展布。最后探讨了构造运动对该区油气分布的影响，以期为A区块和坎波斯盆地盐下油气勘探提供科学依据。
- 盐下 /
- 地震层序 /
- 断裂特征 /
- 构造演化 /
- 油气分布 /
- 坎波斯盆地
Abstract: Block A in the southern Campos Basin in the deep water of Brazil has complicated pre-salt structures as a result of the Late Jurassic tectonic activity. Based on new 3D seismic and drilling data, the geological attributes, fault development and tectonic evolution of pre-salt in block A were reviewed. Four seismic reflection layers and three seismic sequences were identified in the pre-salt section. Block A also experienced three stages of tectonic evolution, including rifting, erosion and tilting as well as thermal subsidence. Additionally, NE and NNE normal faults are well developed in this region. Tectonic activity also resulted in a NW-SE transform fault in the region and this controlled the distribution of normal faults. Finally, the influence of tectonic activity on hydrocarbon distribution was discussed and it is expected to provide scientific basis for the pre-salt exploration activities in block A and Campos Basin.
- pre-salt /
- seismic sequence /
- fault feature /
- tectonic evolution /
- hydrocarbon distribution /
- Campos Basin

HTML全文

图 1 巴西坎波斯盆地A区块区域位置

Figure 1. Location of block A in Campos Basin, Brazil

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图 2 巴西坎波斯盆地地层综合柱状图

据文献[16]修改。

Figure 2. Comprehensive stratigraphic column of Campos Basin, Brazil

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图 3 巴西坎波斯盆地A区块P2井合成地震记录标定

Figure 3. Calibration of synthetic seismogram of well P2 in block A, Campos Basin, Brazil

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图 4 巴西坎波斯盆地A区块经过P2井声波反演剖面

Figure 4. Acoustic inversion profile across well P2 in block A, Campos Basin, Brazil

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图 5 巴西坎波斯盆地A区块地震层序剖面

Figure 5. Seismic sequence profile in block A, Campos Basin, Brazil

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图 6 巴西坎波斯盆地A区块断裂发育地震剖面

Figure 6. Fault development profile in block A, Campos Basin, Brazil

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图 7 A区块断裂平面展布

Figure 7. Fault plane distribution in block A, Campos Basin, Brazil

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表 1 巴西坎波斯盆地A区块地震层序划分

Table 1. Seismic sequence division in block A, Campos Basin, Brazil

地震层序	形成时期	反射特征	沉积相	岩性
层序Ⅰ	过渡早期	在构造高部位表现为强振幅、高频率反射特征，在构造低部位为弱振幅、低频率反射特征	湖相(高盐度)	微生物灰岩
层序Ⅱ	裂谷中后期	总体呈现为平行或亚平行结构，连续性较好，席状外形，强振幅、高频率反射特征	湖相(半深湖、深湖)	泥岩、黑色页岩、灰岩
层序Ⅲ	裂谷早期	总体表现为不连续或较连续的中—强反射振幅，内幕反射较差	火山喷发相	火山岩、夹杂砾岩和砂岩

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